I still have to write the final post of our D&D 3.5/Metamorphosis Alpha/Star Frontiers game. I finally found my game notes so I could complete it, but work has been extremely busy. Check out an old post from 2007 about me mixing Spaceship Zero with Star Frontiers:
http://www.enworld.org/forum/showth...NWorld/page3&p=3540667&viewfull=1#post3540667

That post was made in 2007, way before I started the campaign.
I have an idea of starting a game where the party plays ambassadors to nations on their frontier in order to repair alliances, create trade, solve disturbances before they lead to humanitarian crises, etc. I already have three or so adventures in mind, but I am not sure what genres I should merge. I was thinking I could do it in space, with Pathfinder characters and the Dragonstar campaign setting. The mood would be a combination of Poul Anderson's Flanery series and Keith Lamar's Retief series. Though one adventure is based on a work by Jack Vance I don't want to reveal yet...
http://en.wikipedia.org/wiki/Dragonstar
http://en.wikipedia.org/wiki/Dominic_Flandry
http://en.wikipedia.org/wiki/Jame_Retief
The other option is to make it entirely high or low fantasy, depending on the system used. In the high fantasy system, the party would be made entirely of Bards and alternative Bard classes as found in Pathfinder, since negotiation and diplomacy would be so important and a party made entirely of alterations of one main class type is interesting to me. I recently played in an abandoned game here on ENWorld where we were all deviations from the main Thief Class (bruiser, counterfeiter, etc). However, the players might not want to play an all Bard cast of diplomats. In that case I would lean more on Jack Vance and Glen Cook for tone and I would likely use something like the BECMI, OSRIC, or Castle and Crusades for the rule-set, just because I love the retro systems that much, especially with low fantasy. The campaign setting would be ambiguous, and the party would likely serve an advanced elven kingdom amongst poorer vassal states and nations of dubious moral quality. I would still borrow familiar tropes and twist them a bit, though. For instance, I want to use the drow/dark-elves, but take some examples from Jack Vance to explain their culture and society rather than anything made by Salvatore. Anyway, those are my random thoughts I have yet to really do anything with, so if you have any thoughts or ideas I'd love to hear them.